Development charity Tearfund made three MPs spend a day in a makeshift slum to give them a taste of slum dwellers' daily lives.
David Burrowes (Conservative), Tim Farron (Liberal Democrat) and Andy Reed (Labour) had to build their own shelter near Westminster Abbey and live in it for 24 hours. They had to walk four miles to collect water and could eat only rice and dhal.
More than 230 church youth groups around the UK have taken the same challenge, raising money for development work in Zimbabwe and South Africa.
The initiative, known as Slum Survivor, was timed to coincide with an early day motion that called on the Government to improve the lives of slum dwellers. Tearfund says one in six people around the world are forced to live in slums, often without running water, electricity, employment or schools.
David Westlake, a director of Tearfund and coordinator of the project, says: "As campaigners, we generally have an adversarial approach to politicians, but this was a good way to show the young people involved in the project that not all MPs are on the 'other' side; many believe passionately in social justice. We also wanted to show that it's not enough for people of faith to have a private religion; they should act on what they believe in."
The stunt was covered in the national press.